Use new lib/filesystem.FileSystem.EstimateUsage() in amipublisher.
Use new lib/filesystem.FileSystem.EstimateUsage() in amipublisher.

rgooch/Dominator,Symantec/Dominator,keep94/Dominator,rgooch/Dominator,keep94/Dominator,Symantec/Dominator,rgooch/Dominator,keep94/Dominator,Symantec/Dominator